System and method for recovering desulfurizer in catalytic cracking regeneration exhaust gas after desulfurization

Abstract

The invention relates to a recovery system and method for desulfurization agent in catalytic cracking regeneration waste gas after desulfurization. The recovery system includes a desulfurization tower, a condensation heat exchanger, a mechanical separation purifier, a heating heat exchanger and a filter. The outlet of the desulfurization tower passes through The first pipeline is connected to the air inlet of the mechanical separation purifier, and the condensation heat exchanger is installed in the first pipeline; the heating heat exchanger is installed in the exhaust pipeline of the mechanical separation purifier; the condensation heat exchanger and The mechanical separation purifiers are respectively connected with the filters through second pipelines. The invention can effectively reduce the dew point of the outlet gas of the desulfurization tower, reduce the water vapor content in the outlet gas and the concentration of entrained desulfurizer and catalyst particles, recover most of the desulfurizer, reduce the desulfurizer emission loss, reduce operating costs, and at the same time reduce Environmental pollution is avoided; by setting up a heating heat exchanger, the exhaust gas can be prevented from entering an environment where the temperature is lower than the gas temperature, and liquid droplets will immediately condense out to avoid the formation of white mist.

Description

technical field [0001] The invention relates to the technical field of environmental protection technology, in particular to a system and method for recovering a desulfurizer in gas after desulfurization of catalytic cracking regenerated waste gas. Background technique [0002] Catalytic cracking is an important process in oil refining production. Catalysts for catalytic cracking need to be periodically regenerated, and the waste gas generated during the regeneration process contains pollutants such as sulfur dioxide, which need to be purified by a desulfurization process before being discharged. Desulfurization generally adopts a wet desulfurization process. The desulfurization agent is lye, and the desulfurization agent contacts with the gas and reacts with sulfur dioxide to remove the sulfur dioxide in the gas. The lye can be lime, sodium hydroxide or sodium carbonate, ammonia, etc., and the corresponding desulfurization processes are called calcium desulfurization, sodi...

AI Technical Summary

Problems solved by technology

However, due to the fact that the solid dust carried in the hot flue gas is easy to deposit in the regenerator, this technology causes blockage and operation problems; and heating the gas at the outlet of the desulfurization tower cannot effectively reduce the dew point of the gas. On the one hand, the water vapor entrained in the gas and the desulfurization The agent will still be lost in a large amount, causing pollution after entering the atmosphere. On the other hand, the probability of condensation of the gas in a lower temperature environment is still high, and it is easy to corrode and deposit to block pipes and equipment.

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